Identification of sequence boundary and division of systems tracts in the third member of the Kongdian Formation in southern Kongdian, Huanghua depression

The third member of the Palaeogene Kongdian Formation in southern Kongdian, Huanghua depression is believed to be the earliest sedimentary strata in the Bohai Bay rifted basin. The identification of sequence boundary is based on the lithologic characteristics, well logs and seismic data. The division of the depositional systems tracts is made for the third member of the Palaeogene Kongdian Formation by using the tripartition rule of continental lake basin from Vail's classic sequence stratigraphy.